I would rate this at PG-15 or something, for those that really want to know what might be objectionable scroll down the message, but then again if you're that sensitive you probably wouldn't want to see it at all..
http://www.frashii.com/Weeee.swf
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Warning: This music video contains one instance of profanity, as well as flying genitalia although these are taken from anatomy textbooks.